File Juicer
File Juicer for macOS
Overview of Formats

Search & Extract

Images

jpg jpeg 2000 gif png pdf wmf emf tiff eps pict bmp

Video

mov mpeg avi wmv

Sound

mp3 wav System 7 au aiff

Text

ascii rtf html

From:

avi cab cache chm dmg doc emlx exe ithmb m4p mht mp3 pdf pps ppt raw swf wps xls zip and other formats

CSS - Cascading Style Sheets

Are text files which you can edit with TextEdit, TextMate or any other text editing application. They are used for web design, and contain the layout and style of web pages.

WikiPedia on CSS